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energy on transcription during starvation Stationary phase is caused by rifampin treatment, and sigma factors block rifampin activity, thereby preventing the onset of stationary phase. Sigma factors create extra nutrients by fixing CO2 and N2 in the air, thereby preventing the onset of stationary phase. Different sigma factors recognize different promoters. Sigma factors that recognize stress response and catabolic metabolism promoters are expressed during stationary phase and the housekeeping sigma factor is downregulated. Thus, transcription shifts toward stress response and away from growth. Sigma factors bind the ribosome and block it from translating certain MRNAS that no longer need to be translated in stationary phase

energy on transcription during starvation Stationary phase is caused by rifampin treatment, and sigma factors block rifampin activity, thereby preventing the onset of stationary phase. Sigma factors create extra nutrients by fixing CO2 and N2 in the air, thereby preventing the onset of stationary phase. Different sigma factors recognize different promoters. Sigma factors that recognize stress response and catabolic metabolism promoters are expressed during stationary phase and the housekeeping sigma factor is downregulated. Thus, transcription shifts toward stress response and away from growth. Sigma factors bind the ribosome and block it from translating certain MRNAS that no longer need to be translated in stationary phase

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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How do sigma factors help regulate gene expression during the transition to stationary phase? Sigma factors are transcriptional inhibitors, they stop transcription entirely so the bacteria don't waste energy on transcription during starvation Stationary phase is caused by rifampin treatment, and sigma factors block rifampin activity, thereby preventing the onset of stationary phase. Sigma factors create extra nutrients by fixing CO2 and N2 in the air, thereby preventing the onset of stationary phase. Different sigma factors recognize different promoters. Sigma factors that recognize stress response and catabolic metabolism promoters are expressed during stationary phase and the housekeeping sigma factor is downregulated. Thus, transcription shifts toward stress response and away from growth. Sigma factors bind the ribosome and block it from translating certain MRNAS that no longer need to be translated in stationary phase
Transcribed Image Text:How do sigma factors help regulate gene expression during the transition to stationary phase? Sigma factors are transcriptional inhibitors, they stop transcription entirely so the bacteria don't waste energy on transcription during starvation Stationary phase is caused by rifampin treatment, and sigma factors block rifampin activity, thereby preventing the onset of stationary phase. Sigma factors create extra nutrients by fixing CO2 and N2 in the air, thereby preventing the onset of stationary phase. Different sigma factors recognize different promoters. Sigma factors that recognize stress response and catabolic metabolism promoters are expressed during stationary phase and the housekeeping sigma factor is downregulated. Thus, transcription shifts toward stress response and away from growth. Sigma factors bind the ribosome and block it from translating certain MRNAS that no longer need to be translated in stationary phase
Sigmas is the stationary phase sigma factor. Which of the following is a likely site for RNAP-SigmaS holoenzyme binding? The terminator region of genes involved in starvation stress response The -10 and -35 promoter regions of ribosomal RNA genes The -10 and -35 promoter regions of genes involved in acid stress response The Shine-Delgarno sequence of genes involved in oxidative stress response The CAP operator of the lac operon
Transcribed Image Text:Sigmas is the stationary phase sigma factor. Which of the following is a likely site for RNAP-SigmaS holoenzyme binding? The terminator region of genes involved in starvation stress response The -10 and -35 promoter regions of ribosomal RNA genes The -10 and -35 promoter regions of genes involved in acid stress response The Shine-Delgarno sequence of genes involved in oxidative stress response The CAP operator of the lac operon
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Introduction:

Sigma factors:

These are the multi-domain subunits of bacterial RNA polymerase which play a crucial role in transcription initiation.

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